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Wireless communication system, sim card, mobile communication terminal, and data guaranteeing method

Inactive Publication Date: 2008-12-04
RENESAS TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]An object of the present invention is to provide a technology which can prevent the loss of data stored in a secure memory card, such as a SIM card, resulting from the physical destruction thereof.
[0020](1) Even when the SIM card is destroyed by physical destruction or the like, the loss of the data stored in the SIM card can be prevented.
[0021](2) Because a communication line path in data backup or restoration can be selected arbitrarily, a data communication speed and communication quality can be improved, while performance can be enhanced.
[0022](3) An access limit to the SIM card can be set immediately using another communication terminal so that data protection for the SIM card can be performed more reliably.
[0023](4) The effects (1) to (3) mentioned above allow a significant improvement in the reliability of a wireless communication system constructed using the SIM card.

Problems solved by technology

However, the present inventors have found that a technology for data storage using a SIM card as mentioned above has the following problems.
When bending or distortion resulting from a large external force is applied to the SIM card, the SIM card may be destroyed.
However, all the data stored in the SIM card is lost, which leads to the problem of reduced convenience of the user.

Method used

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  • Wireless communication system, sim card, mobile communication terminal, and data guaranteeing method
  • Wireless communication system, sim card, mobile communication terminal, and data guaranteeing method
  • Wireless communication system, sim card, mobile communication terminal, and data guaranteeing method

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0043]FIG. 1 is an illustrative view showing an example of a structure of a wireless communication system according to the first embodiment of the present invention. FIG. 2 is a block diagram showing an example of respective structures of a memory card provided in a SIM card and a SIM card adapter in the wireless communication system of FIG. 1. FIG. 3 is a flow chart showing an example of a data backup process in the wireless communication system of FIG. 1. FIG. 4 is an illustrative view showing data communication paths in the wireless communication system in the data backup process of FIG. 3. FIG. 5 is a flow chart showing a data restoration process in the wireless communication system of FIG. 1. FIG. 6 is an illustrative view showing data communication paths in the wireless communication system in the restoration process of FIG. 5. FIG. 7 is an illustrative view showing an example when new data overwritten in a memory card is stored in a base station server in the wireless communi...

embodiment 2

[0113]FIG. 9 is an illustrative view showing an example of a structure in a wireless communication system according to the second embodiment of the present invention. FIG. 10 is a flow chart showing an example of a switching process among communication line paths performed by a mobile phone provided in the wireless communication system of FIG. 9. FIG. 11 is a flow chart showing an example of a detailed process in Step S302 of FIG. 10. FIG. 12 is a flow chart showing another example of the detailed process in Step S302 of FIG. 10. FIG. 13 is an illustrative view showing data communication paths in the wireless communication system of FIG. 9. FIG. 14 is an illustrative view showing an example of data backup in the wireless communication system of FIG. 9. FIG. 15 is an illustrative view showing an example of file history management at a base station server in the wireless communication system of FIG. 9.

[0114]In the present second embodiment, the wireless communication system has a stru...

embodiment 3

[0151]FIG. 16 is a flow chart showing an example of a process when an access to a memory card is limited according to the third embodiment of the present invention. FIG. 17 is an illustrative view showing an example of a chip layout of the memory card according to the third embodiment. FIG. 18 is a block diagram showing an example of a structure of the controller of FIG. 17.

[0152]In the present third embodiment, a description will be given to a technology for disabling the use of data in the memory card 9 in the structure of the wireless communication system 1 (FIG. 9) according to the second embodiment described above.

[0153]For example, to disable the use of the data in the memory card 9 in the event of the loss of the mobile phone 2 or the like, an access is made to the base station server 5 from another phone, a personal computer, an Internet terminal, or the like to change an access management file corresponding to each of the SIM cards 6 and set an access denial or an access li...

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Abstract

The loss of data stored in a secure memory card, such as a SIM card, due to the physical destruction thereof is prevented. A host unit performs card authentication of a memory card, and transmits update data for the memory card by security communication to update data when the result of the authentication is OK. Then, the host unit outputs a request for mirror-updating the card data to a base station server. When an access is permitted, the card data is transmitted to the base station server via the host unit to mirror-update the card data. When the mirror-updating of the card data is completed, the base station server returns a completion confirmation to the host unit, so that a data backup process is completed. By thus causing the base station server to mirror-update the data in the memory card, the loss of the stored data is prevented.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The disclosure of Japanese Patent Application No. 2007-146648 filed on Jun. 1, 2007 including the specification, drawings and abstract is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]The present invention relates to a technology for backing up data in a memory card and, more particularly, to a technology which is effective in guaranteeing data in a SIM (Subscriber Identity Module) card or the like.[0003]In recent years, as mobile phones and mobile equipment have been increasingly reduced in size and increased in density, removable memory cards mounted thereon have also been increasingly reduced in size and thickness and increased in density.[0004]As one of memory cards of this type, a SIM card, e.g., is widely used for a mobile phone. In the SIM card, various data including a unique number referred to as IMSI (International Mobile Subscriber Identity), a mobile phone number, and the like is registered....

Claims

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Application Information

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IPC IPC(8): H04M1/00H04W8/20H04W12/06
CPCH04L63/0853H04W8/20H04W12/06
Inventor NISHIZAWA, HIROTAKAKOIKE, HIDEOIWASAKI, HIRONORIOSAKO, JUNICHIROSHINOHARA, MINORUWADA, TAMAKI
Owner RENESAS TECH CORP
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